Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df177b1cd5d9cf3…

MALICIOUS

PDF

106.6 KB Created: 2021-05-07 08:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8883fb6a7342173dee939722f30d3c92 SHA-1: b813bdbb875f727863c511d70d701a08d8507883 SHA-256: 0df177b1cd5d9cf35aeec6f788d8c64e50dff272952e5007cc26c769c07212b6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a lure suggesting the user needs to install a browser extension or update to view content, which is a common social engineering tactic for credential theft or malware installation. It also contains numerous external links, many pointing to PDF files, suggesting a link farm or redirector strategy. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=adobe+xd+minimum+system+requirements PDF link annotation
    • http://mebelintera.ru/resiriperozimexohravq.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/septic_tank_leach_field_design.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/88995419317.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/66659853588.pdfIn PDF document text
    • http://sweetmeet.online/norivomixawenawofucgaok.pdfIn PDF document text
    • http://axecheat7.xyz/hp_officejet_pro_8600_treiber_windows_8.1_downloadk2no5.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/kitonowujam.pdfIn PDF document text
    • http://yoga-italy.space/what_was_the_ninety_five_thesessaffb.pdfIn PDF document text
    • http://laitlabs.pro/tom_sawyer_and_huck_finn_friendshipgovs6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/24547722719.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_2d6c46e7fb264e019fe52c72e3add56e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/critical_race_theory_book.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/53960078337.pdfIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/bovoriwewete.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/27589513703.pdfIn PDF document text
    • https://198ac300-f2de-41a8-aaa9-2df0d2bfefbb.filesusr.com/ugd/232b71_94e0956a9a2f439caaa8bfac40faecac.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_6d72a3df4dec4cec9cfe06ca0109aa87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c43667c-8eb5-4db6-a5d7-72a5931f8bdc/44389841321.pdfIn PDF document text
    • http://rolubumemetujin.atwebpages.com/jepufexemobuzirivadikavop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd450366-7740-4def-99d7-7134912ef6c8/78920480346.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/46847347520.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/438824817.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163A0 5156 bytes
SHA-256: 130973ec2c2d02e90201f29d9597d5edce32a7dbbb973b81dcf1bb00383af026
font_01_sfnt_off00017517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17517 11380 bytes
SHA-256: 0dffc1f8e9d1ee743b5d0366f3eed94990e0e17d5aa5536af89cabe01c26e02b